Meet Mark K. Gruenhagen
Experienced Trial Lawyer
Need a Shark? Call Mark!
More than 30 years of aggressive, prepared, plain-spoken defense for people across Lake County and Northwest Indiana.
A Trial Lawyer in Your Corner
About Mark
Mark K. Gruenhagen has been defending people in Northwest Indiana for more than 30 years. His practice is built on a simple idea: aggressive criminal defense belongs at the heart of every case.
Mark concentrates on felonies at the state and federal level. He’s an experienced trial lawyer who is prepared to take a case in front of a jury — and that matters. Less experienced representation can wrongly convince you that a guilty plea is your only option. Mark gives you an honest assessment of the evidence, explains every option, and fights for the best possible outcome.
Beyond criminal defense, Mark handles OWI cases, traffic tickets and CDL violations, expungements, personal injury and juvenile matters, bringing the same preparation and persistence to each one.
The firm’s calling card — “Need a shark? Call Mark!” — says it plainly. When you’re in deep water, you want someone who’s ready to fight for you. Our clients are like family, and the legal process can be extremely trying. Mark makes sure you never face it alone.
Associations & Background
Credentials
Education
Undergraduate degree from Indiana University. Law degree from Valparaiso University School of Law, 1994.
Licensed in Two States
Admitted to practice law in both Indiana and Illinois.
Federal Courts
Admitted to the U.S. District Court for the Northern District of Indiana, as well as various other federal courts and jurisdictions.
Professional Memberships
Lake County Bar Association, Indiana State Bar Association and the Lake County Criminal Defense Bar.
Areas of Practice
Criminal defense (state and federal), OWI, traffic and CDL, expungement, personal injury and juvenile law.
Available When It Counts
Office hours Monday through Friday, 9:00 AM to 5:00 PM, with weekend appointments available.
What Working With Mark Looks Like
The Approach
Call or Send the Form
Reach out by phone or through the free case evaluation form. Tell us what happened and when your next court date is.
Get an Honest Evaluation
Mark reviews the charges, the evidence and your goals, then explains your real options in plain English — no sugarcoating.
Build a Defense to Fight
From motions to negotiation to trial, Mark prepares your case with one goal: the best possible outcome for you.
Mark handled my ticket and got it removed from my record. I’d highly recommend his services.
Testimonials do not guarantee a similar outcome. Every case is different.
Your Defense Starts With One Call
Need a Shark? Call Mark!
Free case evaluation. Weekday office hours and weekend appointments available.